/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkNIFTIWriter.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * \class vtkNIFTIWriter
 * \brief Write NIfTI-1 and NIfTI-2 medical image files
 *
 * This class writes NIFTI files, either in .nii format or as separate
 * .img and .hdr files.  If told to write a file that ends in ".gz",
 * then the writer will automatically compress the file with zlib.
 * Images of type unsigned char that have 3 or 4 scalar components
 * will automatically be written as RGB or RGBA respectively.  Images
 * of type float or double that have 2 components will automatically be
 * written as complex values.
 *
 * This class was contributed to VTK by the Calgary Image Processing and
 * Analysis Centre (CIPAC).
 *
 * \sa vtkNIFTIReader
 */

#ifndef vtkNIFTIWriter_h
#define vtkNIFTIWriter_h

#include "vtkImageWriter.h"
#include "vtkDICOMModule.h" // For export macro
#include "vtkDICOMConfig.h" // For configuration details

class vtkMatrix4x4;
class vtkNIFTIHeader;

class VTKDICOM_EXPORT vtkNIFTIWriter : public vtkImageWriter
{
public:

  //! Endianness of output file.
  enum EndianEnum {
    BigEndian = 0,
    LittleEndian = 1
  };

  //! Static method for construction.
  static vtkNIFTIWriter *New();
  vtkTypeMacro(vtkNIFTIWriter, vtkImageWriter);

  //! Print information about this object.
  void PrintSelf(ostream& os, vtkIndent indent) VTK_DICOM_OVERRIDE;

  //@{
  //! Set the version number for the NIfTI file format to use.
  /*!
   *  This can be 1, 2, or 0 (the default).  If set to zero, then it
   *  will save as NIfTI version 1 unless SetNIFTIHeader() provided
   *  header information from a NIfTI version 2 file.
   */
  vtkSetMacro(NIFTIVersion, int);
  vtkGetMacro(NIFTIVersion, int);
  //@}

  //@{
  //! Set a short description (max 80 chars) of how the file was produced.
  vtkSetStringMacro(Description);
  vtkGetStringMacro(Description);
  //@}

  //@{
  //! Set the time dimension to use in the NIFTI file (or zero if none).
  /*!
   *  The number of components of the input data must be divisible by the time
   *  dimension if the time dimension is not set to zero.  The vector dimension
   *  will be set to the number of components divided by the time dimension.
   */
  vtkGetMacro(TimeDimension, int);
  vtkSetMacro(TimeDimension, int);
  vtkGetMacro(TimeSpacing, double);
  vtkSetMacro(TimeSpacing, double);
  //@}

  //@{
  //! Set the slope and intercept for calibrating the scalar values.
  /*!
   *  Other programs that read the NIFTI file can use the equation
   *  v = u*RescaleSlope + RescaleIntercept to rescale the data to
   *  real values.  If both the slope and the intercept are zero,
   *  then the SclSlope and SclIntercept in the header info provided
   *  via SetNIFTIHeader() are used instead.
   */
  vtkSetMacro(RescaleSlope, double);
  vtkGetMacro(RescaleSlope, double);
  vtkSetMacro(RescaleIntercept, double);
  vtkGetMacro(RescaleIntercept, double);
  //@}

  //@{
  //! Write planar RGB (separate R, G, and B planes), rather than packed RGB.
  /*!
   *  Use this option with extreme caution: the NIFTI standard requires RGB
   *  pixels to be packed.  The Analyze format, however, was used to store
   *  both planar RGB and packed RGB depending on the software, without any
   *  indication in the header about which convention was being used.
   */
  vtkGetMacro(PlanarRGB, bool);
  vtkSetMacro(PlanarRGB, bool);
  vtkBooleanMacro(PlanarRGB, bool);
  //@}

  //@{
  //! The QFac sets the ordering of the slices in the NIFTI file.
  /*!
   *  If QFac is -1, then the slice ordering in the file will be reversed
   *  as compared to VTK. Use with caution.
   */
  vtkSetMacro(QFac, double);
  vtkGetMacro(QFac, double);
  //@}

  //@{
  //! Set the "qform" orientation and offset for the image data.
  /*!
   *  The 3x3 portion of the matrix must be orthonormal and have a
   *  positive determinant, it will be used to compute the quaternion.
   *  The last column of the matrix will be used for the offset.
   *  In the NIFTI header, the qform_code will be set to 1.
   */
  void SetQFormMatrix(vtkMatrix4x4 *);
  vtkMatrix4x4 *GetQFormMatrix() { return this->QFormMatrix; }
  //@}

  //@{
  //! Set a matrix for the "sform" transformation stored in the file.
  /*!
   *  Unlike the qform matrix, the sform matrix can contain scaling
   *  information.  Before being stored in the NIFTI header, the
   *  first three columns of the matrix will be multiplied by the voxel
   *  spacing. In the NIFTI header, the sform_code will be set to 2.
   */
  void SetSFormMatrix(vtkMatrix4x4 *);
  vtkMatrix4x4 *GetSFormMatrix() { return this->SFormMatrix; }
  //@}

  //@{
  //! Set the NIFTI header information to use when writing the file.
  /*!
   *  The data dimensions and pixdim from the supplied header will be
   *  ignored.  Likewise, the QForm and SForm information in the supplied
   *  header will be ignored if you have called SetQFormMatrix() or
   *  SetSFormMatrix() to provide the orientation information for the file.
   */
  void SetNIFTIHeader(vtkNIFTIHeader *hdr);
  vtkNIFTIHeader *GetNIFTIHeader();
  //@}

  //@{
  //! Set the byte order for the files (default: little endian).
  /*!
   *  These methods allow the byte order of the NIFTI file to be set.
   *  Originally, Analyze files (and NIFTI, by extension) were meant to
   *  be written using the native endianness of the system.  However,
   *  with the overwhelming preference for little-endian architectures
   *  on image processing workstations, defaulting to little endian
   *  files (even on big-endian systems) provides better compatibility.
   */
  vtkSetMacro(DataByteOrder, EndianEnum);
  void SetDataByteOrderToBigEndian() {
    this->SetDataByteOrder(BigEndian); }
  void SetDataByteOrderToLittleEndian() {
    this->SetDataByteOrder(LittleEndian); }
  vtkGetMacro(DataByteOrder, EndianEnum);
  //@}

protected:
  vtkNIFTIWriter();
  ~vtkNIFTIWriter() VTK_DICOM_OVERRIDE;

  //! Generate the header information for the file.
  int GenerateHeader(vtkInformation *info, bool singleFile);

  //! The main execution method, which writes the file.
  int RequestData(vtkInformation *request,
                  vtkInformationVector** inputVector,
                  vtkInformationVector* outputVector) VTK_DICOM_OVERRIDE;

  //! Make a new filename by replacing extension "ext1" with "ext2".
  /*!
   *  The extensions must include a period, must be three characters
   *  long, and must be lower case.  A new string is returned that must
   *  be deleted by the caller.
   */
  static char *ReplaceExtension(
    const char *fname, const char *ext1, const char *ext2);

  //! Time dimension to use in the file.
  int TimeDimension;
  double TimeSpacing;

  //! Information for rescaling data to quantitative units.
  double RescaleIntercept;
  double RescaleSlope;

  //! Set to -1 when VTK slice order is opposite to NIFTI slice order.
  double QFac;

  //! The orientation matrices for the NIFTI file.
  vtkMatrix4x4 *QFormMatrix;
  vtkMatrix4x4 *SFormMatrix;

  //! A description of how the file was produced.
  char *Description;

  //! The header information.
  vtkNIFTIHeader *NIFTIHeader;
  vtkNIFTIHeader *OwnHeader;
  int NIFTIVersion;

  //! Use planar RGB instead of the default (packed).
  bool PlanarRGB;

  //! Whether the file should be little endian.
  EndianEnum DataByteOrder;

private:
#ifdef VTK_DICOM_DELETE
  vtkNIFTIWriter(const vtkNIFTIWriter&) VTK_DICOM_DELETE;
  void operator=(const vtkNIFTIWriter&) VTK_DICOM_DELETE;
#else
  vtkNIFTIWriter(const vtkNIFTIWriter&) = delete;
  void operator=(const vtkNIFTIWriter&) = delete;
#endif
};

#endif // vtkNIFTIWriter_h
